1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 271Get this manual

1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 271

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I_S_H_IM_M_I_NG _
Slowly turn the drive shaft clockwise and counterclockwiseWhen the drive shaft stops in each direction, measure the backlash
2 Adjust: Reverse gear backlash Remove or add